3(a-4)=42

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Solution for 3(a-4)=42 equation: 



3(a-4)=42

We move all terms to the left:

3(a-4)-(42)=0

We multiply parentheses

3a-12-42=0

We add all the numbers together, and all the variables

3a-54=0

We move all terms containing a to the left, all other terms to the right

3a=54

a=54/3

a=18

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